109 lines
2 KiB
ArmAsm
109 lines
2 KiB
ArmAsm
|
/*
|
||
|
|
* linux/arch/unicore32/lib/copy_from_user.S
|
||
|
|
*
|
||
|
|
* Code specific to PKUnity SoC and UniCore ISA
|
||
|
|
*
|
||
|
|
* Copyright (C) 2001-2010 GUAN Xue-tao
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/linkage.h>
|
||
|
|
#include <asm/assembler.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Prototype:
|
||
|
|
*
|
||
|
|
* size_t __copy_from_user(void *to, const void *from, size_t n)
|
||
|
|
*
|
||
|
|
* Purpose:
|
||
|
|
*
|
||
|
|
* copy a block to kernel memory from user memory
|
||
|
|
*
|
||
|
|
* Params:
|
||
|
|
*
|
||
|
|
* to = kernel memory
|
||
|
|
* from = user memory
|
||
|
|
* n = number of bytes to copy
|
||
|
|
*
|
||
|
|
* Return value:
|
||
|
|
*
|
||
|
|
* Number of bytes NOT copied.
|
||
|
|
*/
|
||
|
|
|
||
|
|
.macro ldr1w ptr reg abort
|
||
|
|
ldrusr \reg, \ptr, 4, abort=\abort
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
|
||
|
|
100: ldm.w (\reg1, \reg2, \reg3, \reg4), [\ptr]+
|
||
|
|
.pushsection __ex_table, "a"
|
||
|
|
.align 3
|
||
|
|
.long 100b, \abort
|
||
|
|
.popsection
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
|
||
|
|
100: ldm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
|
||
|
|
.pushsection __ex_table, "a"
|
||
|
|
.align 3
|
||
|
|
.long 100b, \abort
|
||
|
|
.popsection
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro ldr1b ptr reg cond=al abort
|
||
|
|
ldrusr \reg, \ptr, 1, \cond, abort=\abort
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro str1w ptr reg abort
|
||
|
|
stw.w \reg, [\ptr]+, #4
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
|
||
|
|
stm.w (\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8), [\ptr]+
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro str1b ptr reg cond=al abort
|
||
|
|
.ifnc \cond, al
|
||
|
|
b\cond 201f
|
||
|
|
b 202f
|
||
|
|
.endif
|
||
|
|
201: stb.w \reg, [\ptr]+, #1
|
||
|
|
202:
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro enter
|
||
|
|
mov r3, #0
|
||
|
|
stm.w (r0, r2, r3), [sp-]
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro exit
|
||
|
|
add sp, sp, #8
|
||
|
|
ldm.w (r0), [sp]+
|
||
|
|
mov pc, lr
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.text
|
||
|
|
|
||
|
|
ENTRY(__copy_from_user)
|
||
|
|
|
||
|
|
#include "copy_template.S"
|
||
|
|
|
||
|
|
ENDPROC(__copy_from_user)
|
||
|
|
|
||
|
|
.pushsection .fixup,"ax"
|
||
|
|
.align 0
|
||
|
|
copy_abort_preamble
|
||
|
|
ldm.w (r1, r2), [sp]+
|
||
|
|
sub r3, r0, r1
|
||
|
|
rsub r2, r3, r2
|
||
|
|
stw r2, [sp]
|
||
|
|
mov r1, #0
|
||
|
|
b.l memset
|
||
|
|
ldw.w r0, [sp]+, #4
|
||
|
|
copy_abort_end
|
||
|
|
.popsection
|
||
|
|
|